workingctx: add a way for extensions to run code at status fixup time
Some extensions like fsmonitor need to run code after dirstate.status is
called, but while the wlock is held. The extensions could grab the wlock again,
but that has its own peculiar race issues. For example, fsmonitor would not
like its state to be written out if the dirstate has changed underneath (see
issue5581 for what can go wrong in that sort of case).
To protect against these sorts of issues, allow extensions to declare that they
would like to run some code to run at fixup time.
fsmonitor will switch to using this in the next patch in the series.
# hgweb/wsgicgi.py - CGI->WSGI translator
#
# Copyright 2006 Eric Hopper <hopper@omnifarious.org>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
#
# This was originally copied from the public domain code at
# http://www.python.org/dev/peps/pep-0333/#the-server-gateway-side
from __future__ import absolute_import
from .. import (
encoding,
util,
)
from . import (
common,
)
def launch(application):
util.setbinary(util.stdin)
util.setbinary(util.stdout)
environ = dict(encoding.environ.iteritems())
environ.setdefault('PATH_INFO', '')
if environ.get('SERVER_SOFTWARE', '').startswith('Microsoft-IIS'):
# IIS includes script_name in PATH_INFO
scriptname = environ['SCRIPT_NAME']
if environ['PATH_INFO'].startswith(scriptname):
environ['PATH_INFO'] = environ['PATH_INFO'][len(scriptname):]
stdin = util.stdin
if environ.get('HTTP_EXPECT', '').lower() == '100-continue':
stdin = common.continuereader(stdin, util.stdout.write)
environ['wsgi.input'] = stdin
environ['wsgi.errors'] = util.stderr
environ['wsgi.version'] = (1, 0)
environ['wsgi.multithread'] = False
environ['wsgi.multiprocess'] = True
environ['wsgi.run_once'] = True
if environ.get('HTTPS', 'off').lower() in ('on', '1', 'yes'):
environ['wsgi.url_scheme'] = 'https'
else:
environ['wsgi.url_scheme'] = 'http'
headers_set = []
headers_sent = []
out = util.stdout
def write(data):
if not headers_set:
raise AssertionError("write() before start_response()")
elif not headers_sent:
# Before the first output, send the stored headers
status, response_headers = headers_sent[:] = headers_set
out.write('Status: %s\r\n' % status)
for header in response_headers:
out.write('%s: %s\r\n' % header)
out.write('\r\n')
out.write(data)
out.flush()
def start_response(status, response_headers, exc_info=None):
if exc_info:
try:
if headers_sent:
# Re-raise original exception if headers sent
raise exc_info[0](exc_info[1], exc_info[2])
finally:
exc_info = None # avoid dangling circular ref
elif headers_set:
raise AssertionError("Headers already set!")
headers_set[:] = [status, response_headers]
return write
content = application(environ, start_response)
try:
for chunk in content:
write(chunk)
if not headers_sent:
write('') # send headers now if body was empty
finally:
getattr(content, 'close', lambda : None)()